I studied your website and found that it is alternative to project collaboration tools like trello, slack, gridle etc. And your most targeted audience would be B2B audiences like project manager, business owners, team leaders, CTO etc.
To run B2B campaign would be costlier as compare to other option. Here I recommend narrow-down your targeting by city / area to start with. Also focus on keyword targeting and go for exact or phrase match keywords (2-3 words atleast). Don’t go for broad match keywords to save money.
Pro tip: For your product, Linkedin paid marketing will help more but they charge very high as compare to Google adwords.